Jaymi - who has been in a relationship with his hairdresser boyfriend for three years - told the Sun on Sunday: "Every boyband has got to have a gay one! And Louis just said: 'Do it!'"
And the 22-year-old singing hopeful has the full support of his Union J bandmates Josh Cuthbert, George Shelley and Jamie Hamblett.
After the news broke, they tweeted: “Wanted to say how proud we are of our brother Jaymi for coming out and being proud of his sexuality! We are SO proud.”
Jaymi - who came out to his parents when he was 14 - says he was prompted to go public after being inspired by a young fan who asked him if the rumours about his sexuality were true.
"If I can help just one kid out, that's enough for me," he said.
"I didn't want to do it in five year's time when I have a career. I don't think anyone should have to hide who they are."
href="http://www.huffingtonpost.co.uk/2012/11/06/huffpost-celeb-awards-201_n_2082275.html" target="_hplink">VOTE IN THE 2012 HUFFPOST CELEB AWARDS